Bert schultz-ilencke



UNITED STATES PATENT OFFICE.

DANKMAR CARL SIEGBERT SCHULTZ-HEUOKE, OF BERLIN, GERMANY, ASSIGNOR TO ENRIQUE GOLDSOIIMIDT, OF GIIARLOTTENBURG,

G RMANY.

PHOTOGRAPHlC-PRINTING PROCESS.

SPECIFICATION formingpart of Letters Patent No. 623,491, dated April 18, 1899.

Application filedAugust17,1898. Serial No. 688,803. (No specimens.) I

To aZZ whmn it may concern.-

Be it known that I, DANKMAR CARL SIEG- BERT SCHULTZ-HENOKE, a subject of the King of: Prussia, German Emperor, residing at Berlin, Prussia, Germany, have invented certain new and useful Improvements in Processes for Rapidly Photographing, (for which I have applied for a patent in Germany, filed July 12,'1S9S,) of which the following is a specification.

The present invention relates to photographing processes in which the sensitive plate produced serves as a negative from which any number of copies may be made.

lhe object of the invention is to provide a much quicker process by which the copies may be secured than in the process heretofore known.

The quickness in the new process,which is considerably superior to that of the older processes, is attained in the following manner: In photographic practice it is usual to obtain from thin weak negatives a stronger copy by copying under silk paper or when the negative is very thin under yellow glass or yellow waxed taffetas. Upon this principle the new process is based. The photograph is taken, and the view is developed by means of a strong developer only to such an extent that in looking over all the details come in sight. The plate is then very rapidly washed, and while it is still wet and not fixed a sheet of bromic or other very sensitive copying-paper is placed thereon and squeezed on by means of a rubber squeezer, and then, as in the usual copying process, a so-callec contact-copy is printed by exposing for a few seconds at the light of a lamp. The copying-paper is then lifted off and developed in a suitable developer for being fixed and washed afterward.

By omitting the fixing of the photographingplate the yellow bromic silver is preserved in the layer and acts as the above-mentioned yellow veil in copying the thiunegative, and by this means a clear strong picture is obtained from the latter, notwithstanding its d ullness,which renders it completely unfit for use in the ordinary process.

By proceeding in the above-described manner all the time is gained, as easily will be understood,which formerly was necessary for washing out the negative, for fixing it, and for thoroughly washing out again.

The application of the bromic-silver paper upon the wet non-fixed negative is done not only for saving time, but also, which in the dark can be judged of with difficulty, for obtaining an intimate contact between the layer and thebromic-silver paper. To attain the the latter still more rapidly and precisely, the copying-paper prior to its application is also thoroughly moistened below the water-cock or by immersing it into a bowl containing water, so that after application there is only water between the two layers, which is laterally pressed out by passing over with the rubber squeezer. bubbles are avoided, and the formation of spots resulting from the different refraction of the light in copying is prevented.

The process above described allows, therefore, of producing within less than four minutesas numerous tests have proved, even within less than three minutes after photographing-photographic positive pictures either on paper or on other material and of manufacturing, moreover, within a comparatively shorter time from the existing negative any desired number of copies.

When a number of copies are made, it may occur that, owing to the rapid washing a very small quantity of the developer remains on the negative and by this the plate would be acted upon, so that the last pictures would not be as good as the first. This drawback may be avoided by immersing the rinsed plate for a few seconds into an aqueous solution of bromide of potassium. A small portion of the solution of bromide of potassium remaining, owing to the very rapid rinsing off, in the layer acts'in the subsequent copying process not only not prejudicial, but contributes also in bromic-silver paper to the production of a picture rich in contrasts, whereby the de-- crease of power, which in using bromic silver always takes place during the drying, is compensated.

I claim- 1. The herein-described method of photographing consisting in developing the nega- By manipulating in this way air unfixed plate while still wet and pressing it closely thereagainst, exposing the negative and paper to the light and finally removing the sensitive paper and developing, fixing and Washing the same in the usual manner, substantially as described.

In Witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

llAXlUllR CARL Sllitillllll'l SO11 L'L'lZ-HENCKE Witnesses:

CARL MULLER, GUs'rAv HULSMANN. 

